[master] 6939fa2fd build: Retain LIBVARNISHAPI_3.0 symbols

[Dridi Boukelmoune]

commit 6939fa2fdda8e5aae532b8ee2b0d26b844a72864
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Aug 18 12:37:45 2023 +0200

    build: Retain LIBVARNISHAPI_3.0 symbols

diff --git a/lib/libvarnishapi/libvarnishapi.map b/lib/libvarnishapi/libvarnishapi.map
index 5fe72f3fb..87a23a2b6 100644
--- a/lib/libvarnishapi/libvarnishapi.map
+++ b/lib/libvarnishapi/libvarnishapi.map
@@ -28,7 +28,7 @@
  * SUCH DAMAGE.
  */
 
-LIBVARNISHAPI_3.1 {	/* 2023-09-15 release */
+LIBVARNISHAPI_3.0 {	/* 2021-09-15 release */
     global:
 	# vas.c
 		VAS_errtxt;
@@ -44,10 +44,6 @@ LIBVARNISHAPI_3.1 {	/* 2023-09-15 release */
 		VCS_Message;
 		VCS_String;
 
-	# venc.c
-		VENC_Encode_Base64;
-		VENC_Decode_Base64;
-
 	# vsb.c
 		VSB_bcat;
 		VSB_cat;
@@ -166,3 +162,13 @@ LIBVARNISHAPI_3.1 {	/* 2023-09-15 release */
     local:
 	*;
 };
+
+LIBVARNISHAPI_3.1 {	/* 2023-09-15 release */
+    global:
+	# venc.c
+		VENC_Encode_Base64;
+		VENC_Decode_Base64;
+
+    local:
+	*;
+};